Question

我按照指南here设置了GridView。现在我想以编程方式更改其中一个图像（用户执行不点击图像进行更改）。如果我知道图像在网格中的位置，我该怎么做？

Answer 1

离开我的头顶，您可以创建适配器显示的对象。让你的getView（）方法在该对象中设置ImageView引用。

完成后，可以使用getItem（）方法返回该对象，获取对ImageView的引用，然后以编程方式设置图像。

如果您正在使用该指南中的确切实现，则可以使用ArrayList。

public class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<ImageView> mImageViewArrayList = new ArrayList<>(mThumbIds.length);

public ImageAdapter(Context c) {
    mContext = c;
} 

public int getCount() { 
    return mThumbIds.length;
} 

public ImageView getItem(int position) {
    return mImageViewArrayList.get(position); 
} 

public long getItemId(int position) {
    return 0; 
} 

// create a new ImageView for each item referenced by the Adapter 
public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if (convertView == null) {
        // if it's not recycled, initialize some attributes 
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(8, 8, 8, 8);
    } else { 
        imageView = (ImageView) convertView;
    } 

    mImageViewArrayList.set(position,imageView);

    imageView.setImageResource(mThumbIds[position]);
    return imageView;
} 

// references to our images 
private Integer[] mThumbIds = {
        R.drawable.sample_2, R.drawable.sample_3,
        R.drawable.sample_4, R.drawable.sample_5,
        R.drawable.sample_6, R.drawable.sample_7,
        R.drawable.sample_0, R.drawable.sample_1,
        R.drawable.sample_2, R.drawable.sample_3,
        R.drawable.sample_4, R.drawable.sample_5,
        R.drawable.sample_6, R.drawable.sample_7,
        R.drawable.sample_0, R.drawable.sample_1,
        R.drawable.sample_2, R.drawable.sample_3,
        R.drawable.sample_4, R.drawable.sample_5,
        R.drawable.sample_6, R.drawable.sample_7
}; 
}

然后在你想要以编程方式更改它的课程中。

private void setImage(int position, int image){
    mAdapter.getItem(position).setImageResource(image);
}

Android：以编程方式在GridView中更改图像

1 个答案: